<template>
    <el-row class="tac">       
        <el-col :span="24">           
            <el-menu default-active="2" class="el-menu-vertical-demo"             @open="handleOpen" @close="handleClose" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
                <el-submenu index="1">
                    <template slot="title">
                        <i class="el-icon-location"></i>
                        <span>导航一</span>
                    </template>
                    <el-menu-item-group>
                        <template slot="title">分组一</template>
                        <el-menu-item index="1-1">选项1</el-menu-item>
                        <el-menu-item index="1-2">选项2</el-menu-item>
                    </el-menu-item-group>
                    <el-menu-item-group title="分组2">
                        <el-menu-item index="1-3">选项3</el-menu-item>
                    </el-menu-item-group>
                    <el-submenu index="1-4">
                        <template slot="title">选项4</template>
                        <el-menu-item index="1-4-1">选项1</el-menu-item>
                    </el-submenu>
                </el-submenu>
                <el-menu-item index="2">
                    <i class="el-icon-menu"></i>
                    <span slot="title">导航二</span>
                </el-menu-item>
                <el-menu-item index="3">
                    <i class="el-icon-setting"></i>
                    <span slot="title">导航三</span>
                </el-menu-item>
            </el-menu>
        </el-col>
    </el-row>
</template>


<script>
export default {
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    }
  }
};
</script>